Datasheet

 2009-2016 Microchip Technology Inc. DS60001156J-page 177
PIC32MX5XX/6XX/7XX
15.0 WATCHDOG TIMER (WDT)
This section describes the operation of the WDT and
Power-up Timer of the PIC32MX5XX/6XX/7XX.
The WDT, when enabled, operates from the internal
Low-Power Oscillator (LPRC) clock source and can be
used to detect system software malfunctions by reset-
ting the device if the WDT is not cleared periodically in
software. Various WDT time-out periods can be
selected using the WDT postscaler. The WDT can also
be used to wake the device from Sleep or Idle mode.
The following are key features of the WDT module:
• Configuration or software controlled
• User-configurable time-out period
• Can wake the device from Sleep or Idle mode
FIGURE 15-1: WATCHDOG TIMER AND POWER-UP TIMER BLOCK DIAGRAM
Note: This data sheet summarizes the features
of the PIC32MX5XX/6XX/7XX family of
devices. However, it is not intended to be
a comprehensive reference source. To
complement the information in this data
sheet, refer to Section 8. “Watchdog
Timer and Power-up Timer”
(DS60001114) in the “PIC32 Family
Reference Manual”, which is available
from the Microchip web site
(www.microchip.com/PIC32).
Wake
WDTCLR = 1
WDT Enable
LPRC
Power Save
25-bit Counter
PWRT Enable
WDT Enable
LPRC
WDT Counter Reset
Control
Oscillator
25
Device Reset
NMI (Wake-up)
PWRT
PWRT Enable
FWDTPS<4:0> (DEVCFG1<20:16>)
Clock
Decoder
1
1:64 Output
0
1
WDT Enable
Reset Event